Late nights, constant stress, and hormonal imbalances have become part of modern life. Hair loss has followed suit, becoming a common concern among younger generations. Beyond lifestyle factors, androgenetic alopecia is also a common form of hair loss. As the exploration for treatment continues, NMN has evolved from a interesting clue to an evidence-supported solution. Multiple studies suggest that NMN shows potential in reversing follicle damage and improving hair quality at the cellular level, offering a scientifically grounded approach to hair health. NMN has also been used as a positive control in scalp anti-aging and hair-repair studies evaluating other candidates [8,9]. In terms of application scenarios, NMN is expanding from a single anti-aging supplement into multi-dimensional health management applications. Meanwhile, researchers are advancing from animal models to human clinical trials, utilizing cell-based assays to deepen mechanistic understanding and build verifiable evidence.